View Compilation Error

0_0_25928667_11552.cpp: In function 'long long int C(long long int, long long int)':
0_0_25928667_11552.cpp:35:8: error: 'n' was not declared in this scope
     if(n < 0 || m < 0 || m > n)
        ^
0_0_25928667_11552.cpp:35:17: error: 'm' was not declared in this scope
     if(n < 0 || m < 0 || m > n)
                 ^